Experimental Study on the Dielectric Spectrum of Cotton Fiber Aggregation

The dielectric spectrum of cotton fiber aggregation was tested with broadband dielectric spectrum measurement system in this paper. The relationship between the real part of permittivity and the bulk density of cotton fiber aggregation was then analyzed with least squares method. Experimental results show that, there is nearly a linear relationship between the real part of permittivity and the bulk density of the fiber aggregation at the frequency ranging from 100 kHz to 20MHz when the fiber aggregation was introduced into a parallel plate capacitor with constant volume. Moreover, for the dielectric constant measurement of cotton fiber aggregation, the measurement frequency should be greater than 100 kHz in order to decrease the measurement error.